#include <iostream>
#include <string>
template < class T,
class = typename std::enable_if<std::is_integral<T>::value>::type>
std::string operator +(std::string& rhs, const T& lhs)
{
return rhs + std::to_string(lhs);
}
int main() {
std::string s("test");
std::cout << s+'c';
}
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